Nima uchun payvandlangan oyoq barmoqli titaniumli suv isitgichi (stress kontsentratsiyasi omili)<1.2) Outlast An As-Welded Joint (SCF >3) 90 darajali dengiz suvining katodik himoya tizimida 5 faktor bo'yicha?
Xabar QOLDIRISH
90 daraja dengiz suvi katodli himoya tizimida titaniumli isitgichlar ham korroziy hujumga, ham vodorodning mo'rtlashishiga duchor bo'ladi. Payvand choki yuqori stress kontsentratsiyasining hududidir. Payvandlangan bo'g'inlar 3–5 kuchlanish kontsentratsiyasi omiliga ega bo'lgani uchun, silliqlangan payvand barmoqlari esa SCFni kamaytiradi.<1.2. The higher SCF amplifies tensile stresses, promoting hydrogen-induced cracking and fatigue crack initiation. Reducing SCF by polishing extends service life by a factor of 5.
Miqdoriy charchoq hayoti va stress konsentratsiyasi omili
2-darajali titanium uchun 90 graduslik katodli himoyalangan dengiz suvida (-0,85 V va Ag/AgCl):
| Payvandlash oyoq barmoqining holati | SCF | Cycles to Crack Initiation | As-payvandlanganga nisbatan hayot |
|---|---|---|---|
| Payvandlangan-dek, oʻtkir tirqish | 4–5 | 10,000–30,000 | 1× |
| Payvandlangan-dek, oʻrtacha | 3–4 | 20,000–50,000 | 1.5× |
| Tuproq silliq | 1.5–2 | 50,000–150,000 | 3× |
| Jilolangan (mexanik) | 1.2–1.5 | 80,000–200,000 | 4× |
| Elektropollangan (SCF<1.2) | <1.2 | 150,000–300,000 | 5–7× |
Katodik himoya potentsialining SCF ta'siriga ta'siri
| CP potentsiali (V va Ag/AgCl) | As- Payvandlash muddati (tsikllar) | Jilolangan hayot (tsikllar) | Hayot nisbati |
|---|---|---|---|
| -0.80 | 100,000–200,000 | 500,000–1,000,000 | 5× |
| -0.85 | 30,000–60,000 | 150,000–300,000 | 5× |
| -0.90 | 10,000–20,000 | 50,000–100,000 | 5× |
| -0.95 | 5,000–10,000 | 25,000–50,000 | 5× |
Payvandlash oyoq barmoqlarini tugatish bo'yicha qo'llanma
| Xizmatning jiddiyligi | Kerakli payvandlangan oyoq barmoqlarini tugatish | SCF maqsadi | Kutilayotgan charchoq hayotini yaxshilash |
|---|---|---|---|
| Past sikl (<10,000 total) | Payvandlangan-dek | <4 | 1× |
| O'rtacha tsikl (10 000–50 000) | Tuproq silliq | <2 | 3× |
| Yuqori sikl (50 000–200 000) | Jilolangan | <1.5 | 4× |
| Very high cycle (>200,000) | Elektropollangan | <1.2 | 5–7× |
Muhandislik bo'yicha tavsiya
90 darajali katodik himoyalangan dengiz suvidagi titanli isitgichlar uchun barcha payvand choklari silliq silliq va SCF ga erishish uchun elektropolizlangan bo'lishini belgilang.<1.2. By reducing stress concentration, the engineer extends fatigue life by a factor of 5 compared to as-welded joints.
